Insulating device



FIG. 1 is a top, front, left perspective view of an insulating device showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof; and,

FIG. 5 is a left side view thereof.

The broken lines immediately adjacent to the shaded areas illustrate a boundary and form no part of the claimed design. The broken lines showing the remainder of the insulating device illustrate subject matter that forms no part of the claimed design. 

CLAIM The ornamental design for an insulating device, as shown and described. 